Jacked in New Year's resolutions? Wimped out of NaNoWriMo? Scoff at therapy, coaching and all that? Well here's a way to engage in self improvement your own way, egged on by a bunch of comedians, writers, musicians and other folk. What do you want to do? Learn a language, do star jumps, write a letter, memorise a motorway, commence a project, take a photo - whatever tickles your aspirational glands. When you've plumped for your personal challenge, simply register at the website and make your pledge for your hundred day ambition. Then begin on 1st December.

Follow everyone's progress on twitter @hundredday, in pictures at flickr and on the website. It all builds up to a gig and exhibition of what everyone's been up to at the smashing London Word Festival on 10th March 2010.